<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap demo</title>
    <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
    <script src="./common.js"></script>
</head>

<body>
    <header>
        <!-- 页头 -->
        <nav class="navbar navbar-expand-lg navbar-light bg-light">
            <a class="navbar-brand" href="#">分类信息网</a>
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active"><a class="nav-link" href="#">首页</a></li>
                <li class="nav-item"><a class="nav-link" href="#">个人中心</a></li>
                <li class="nav-item"><a class="nav-link" href="#">欢迎**用户</a></li>
                <li class="nav-item"><a class="nav-link" href="#">帮助中心</a></li>
            </ul>
        </nav>
    </header>
    <!-- 正文 -->
    <article class="jumbotron">
    </article>
    <!-- 页脚 -->
    <footer>
    </footer>
</body>

</html>